“If, then, a phenomenon admits of a complete mechanical explanation, it will admit of an infinity of others, that will render an account equally well of all the particulars revealed by experiment.”

2000s, Is Diversity Good? (2003)
Context: To allow slavery to be introduced into free territories, where it had not hitherto existed, was, Abraham Lincoln held, a very bad thing. His opponent, Stephen A. Douglas, held that it was a sacred right, belonging to the people of each territory, to decide for themselves whether or not to have slavery among their domestic institutions. According to Douglas, Lincoln wanted to destroy the diversity upon which the union had subsisted, by insisting that all the states ought to be free. But for Douglas himself, the principle of 'popular sovereignty' did not admit of exceptions. There was to be no diversity, no deviation from the right of the people to decide. For Lincoln the wrongness of slavery meant that no one, and no people, had the right to decide in its favor. For Lincoln, the principle of human equality, "that all men are created equal", did not admit exceptions.

Context: Of course, we must avoid postulating a new element for each new phenomenon. But an equally serious mistake is to admit into the theory only those elements which can now be observed. For the purpose of a theory is not only to correlate the results of observations that we already know how to make, but also to suggest the need for new kinds of observations and to predict their results. In fact, the better a theory is able to suggest the need for new kinds of observations and to predict their results correctly, the more confidence we have that this theory is likely to be good representation of the actual properties of matter and not simply an empirical system especially chosen in such a way as to correlate a group of already known facts.

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Section 10
Culture Industry Reconsidered (1963)
Context: The phrase, the world wants to be deceived, has become truer than had ever been intended. People are not only, as the saying goes, falling for the swindle; if it guarantees them even the most fleeting gratification they desire a deception which is nonetheless transparent to them. They force their eyes shut and voice approval, in a kind of self-loathing, for what is meted out to them, knowing fully the purpose for which it is manufactured. Without admitting it they sense that their lives would be completely intolerable as soon as they no longer clung to satisfactions which are none at all.

Source: The Province of Jurisprudence Determined (1832), p. 6

"Evil Is Alive And Well"
Seeing Things (2008)
Context: When midnight's done, and the day won't start,
And all I ever gave you was a broken heart,
It's hard to admit but it's easy to tell
That evil is alive and well.

1900s, The Moral Equivalent of War (1906)
Context: The militarily-patriotic and the romantic-minded everywhere, and especially the professional military class, refuse to admit for a moment that war may be a transitory phenomenon in social evolution. The notion of a sheep's paradise like that revolts, they say, our higher imagination. Where then would be the steeps of life? If war had ever stopped, we should have to re-invent it, on this view, to redeem life from flat degeneration.
Reflective apologists for war at the present day all take it religiously. It is a sort of sacrament. It's profits are to the vanquished as well as to the victor; and quite apart from any question of profit, it is an absolute good, we are told, for it is human nature at its highest dynamic.

Source: Report of the Superintendent of the New York and Erie Railroad to the Stockholders (1856), p. 59. Cited in: Vose (1857: p. 413)

Source: Sir William Herschel: His Life and Works (1880), Ch.4 "Life and Works" on his discovery of the infrared light.